perf record: Disallow -c and -F option at the same time

It's confusing which one is effective when the both options are given.
The current code happens to use -c in this case but users might not be
aware of it.  We can change it to complain about that instead of relying
on the implicit priority.

Before:

  $ perf record -c 111111 -F 99 true
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.031 MB perf.data (8 samples) ]

  $ perf evlist -F
  cycles: sample_period=111111
  $

After:
  $ perf record -c 111111 -F 99 true
  cannot set frequency and period at the same time
  $

So this change can break existing usages, but I think it's rare to have
both options and it'd be better changing them.

Suggested-by: Alexey Alexandrov <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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